Sensitive drilling platform

[mklotz]

What level of spindle runout do you get with your Unimat Mill? What drill mounting technique do you use to minimize drill runout? The Sherline threaded 5/32" Jacobs chuck is advertised at 0.003" runout, although they do offer a Morse arbour spindle chuck option which would reduce runout.

I've never really measured the runout on my Unimat (now permanently set up as a mill/drill press). Given the results mentioned above, it's not enough to interfere with drilling #75 holes. That's good enough for me.